The piece lacking in a computer

Logic is the art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding.

Computer logic follows this pattern since computers are created by human brains, but what follows can be different.
I would define computer logic as "Rock logic" while human logic as "Water logic".

Rock logic is solid, hard, permanent, inert and unchanging, while water logic is fluid and flows according to gradient (context) and assumes form according to space (circumstance).
If you add one rock to another, you get two, if you add water to water, it changes shape.

That is the piece lacking in a computer: fluidity.